ok i have this idea about how immortality, and death in the world
1: not all are immortal just long-lived, only lived to be 100, or undead and infertile unless they use a spell or decide to be fully alive and immortal but is only
those who feel like they want to live their full lives in the present unlike in the past but are still very few
2: immortals can have kids but they have all the time in the world and never become infertile or whatever, the kids would be immortal if born to immortal parents, but if one parent is immortal while the other is not then the baby will be long-lived
3: the mortal spouse would become immortal so they can be with the spouse but the baby can choose to become immortal but most would end up staying mortal, yes is sad but the parents will understand especially if the kid found love or knows that eventually they will find love
4: but this does not have to be a sad situation, yes is still sad and there will be morning but the rule of this land is that thanks to spell, things like spirits both from those who died and things like nature spirits can be seen physically by anyone during the fall season and after 1 year after a loved one’s death they will be seen again this would happen to the immortal’s mortal kid and is a happy reunion. about grandchildren, the immortal parents and grandparents will take care of and help guide the future generations of their family.
bonus facts:
a vampire can become fertile thanks to a spell including older ones but they would have to stay young looking for a while (especially the mother) this is very rare. more often in the past, a vampire can fall in love with a mortal and can choose to start a family and this would lead to hybrids with eventually would be the more common form of vampire to see since they are long live and there could already be some out there and are the most common form of vampire to see since pure vampires children are rare.
this is just my idea so far though what do you think?
i just want to make sure if this is ok and not imply any bad rules or leadership or anything questionable